Load transfer device



May 21, 1940.

vA.VE. BRICKMAN EI'AL LOAD TRANSFER DEVICE ori Filed Aug. so. 1957 Patented May 21, 1940 LOAD TRANSFER DEVICE- Alan E. Brickman, Rostravor Township, West. moreland County, Pa., and George A. Gleason, Worcester, Mass., assignors to The American Steel and Wire Company of New Jersey, a corporation of New Jersey Continuation of application Serial No. 161,684, `August 30, 1937. This application September 28, 1938, Serial No. 232,200

5 Claims.

The. present invention relates to a load transfer device forA transverse joints in concrete roadways, walks andthe like.

An object of the invention is to provide a load transfer device for concrete pavements having interfltting units of identical construction.

A further object of the invention is to provide a load transfer device having both vertical and horizontal bearings which transmit applied loads so that `they are resisted by. the compressive strength of the concrete.

Other objects and advantages will become apparent as the description proceeds, and reference is made to the accompanying drawing, in which:

Figure 1 is a sectional view of the joint construction on the line I-I of Figure 2;

Figure 2 is a side elevation, partly broken away, to show how the tongue plate of one unit forming the load transfer deqyice is slidably positioned within the dowel receiving pocket of the adjoining unit; and

Figure 3 is a section on the line III-III of Figure 2.

Referring more particularly to the drawing, the load transfer device comprises two intert-i ting complemental members indicated generally at A and B, both of which are identical in construction. Each unit or member forming onehalf of the load transfer device may be, if desired, made from rolled steel sheets and comprises a plate 2 provided with a cut-out portion 3 and laterally extending flanges 9 and I0. The iianges 9 provide bonding means for the complemental unitswhen assembled in the concrete, while the flanges Ill serve the purpose of vertically and horizontally aligning the units in relation to the joint.

Secured to each plate 2 by welding, or vin any other conventional manner, is a plate 4. This plate is provided with a dowel 5 and longitudinally disposed parallel stressed bearing iianges II. The dowel 5 is provided with a rack 6 on one of its faces to cooperate with a pawl 1 provided on a cover plate 8 which' is welded, or otherwise suitably secured, to said plate 2 over that area of the cut-out portion 3, thereby forming a dowel receiving pocket I2 having a depth not less than the length of the dowel 5.

In assembling the transload device, the units A and B are reversely arranged and positioned, as shown in Figure 2, so that the dowel 5, of unit A, extends through an aperture formed in a conventional type joint filler I6 into the dowel receiving pocket I2 in unit B, while the dowel 5, of unit B, extends through the same aperture in said flller I6 into the dowel receiving -pocket I2. of `unit A, thereby providing a load transfer device having dowels arranged in reverse slidable contact with the pockets of the respective units and the joint filler. The horizontal edges of each dowel 5 are in slidable contact with the edges I5 of the pockets .I2 of veach unit. Upon slidably positioning the respective dowels 5 within the pockets formed in the units A and B, the pawl 'I of the respective units A and B cooperates with the rack 6 on the respective dowels`5 `for providing a means whereby the component parts, forming the load transfer assembly, may be initially held in proper position until the poured concrete has set.

By positioning the units, as shown in Figure 2, the flanges 9 of the units A and B extend in opposite directions and serve to bond the complemental units A and B ln the concrete. The flanges I0 extend in opposite directions, as shown in Figure 1, due to the `units being reversely arranged and thereby provide for vertical and horizontal alignment of the units in relation to the road joint. The iianges II extend longitudinally of the load transfer device with the flanges on unit A on one side of the assembly and the flanges on unit B extending outwardly on the other side of the assembly. This device, when thus assembled to the transverse joint of a cement concrete highway, provides an assembly which transmits loads from one concrete slab to the adjacent slab so that vthe surface upon which vehicles travel is maintained in substantial alignment across the transverse joint and will permit expansion and contraction of the concrete slabs.

The cooperation between the pawl I and the rack 6 of the respective units provides a means for initially holding the component parts forming the load transfer device in proper position, upon the roadbed, until the concrete which is poured to form the slabs has set. After the load transfer i 1. In a road joint forming mechanism, the como bination of complementary load transmission anchoring units comprising vertically arranged Plate members, the plate members on each side forming a pocket, and a tongue carried by the opposed plate and occupying said pocket, said units formstrength of the concrete. lcf

- covered by a sheet on one side and by a plate on ing the joint including means for initially maintaining said units in position durng the pouring of the concrete and means on said units forming vertical and horizontal bearing surfaces so that' when said joint is embedded in concrete said bearing surfaces will transmit applied loads so that said loads are restricted by the compressive 2. A load transmission expansiony joint for concrete roadways comprising complementary units initially interlocked so as to maintain said units in position during the pouring of the concrete, said units each comprising a vertically positioned plate member provided with an opening, a plate member provided with a tongue extending therefrom, a cover plate for the opening of each plate member, said tongue adapted to slide within the pocket formed by said plate members whereby the complementary units expand and contract `when the adjoining sections of the concrete roadway expand and contract under changes in temperatures,y

3.` A load transmission expansion joint for concrete roadways comprising vertically positioned complementary units, means adapted to initially interlockfsaid units, said units each comprising a plate member provided with an opening and the other side so as to provide a dowel receiving pocket, said last-mentioned plate provided with a dowel projecting therefrom and adapted to slidably interni; with the dowel receiving pocket of the adjoining complemental unit.

4. A load transmission expansion joint for concrete roadways comprising vertically positioned complementary units, means adapted to initially interlock said units, said units each comprising a plate member provided with an opening and covered by a sheet on one side and by a plate on the other side so as to provide a dowel receiving pocket, said last-mentioned plate rovided with a dowel projecting therefrom an adapted t0 siidably interiit with the dowel receiving pocket of the adjoining complemental unit, and ilanges on each unit affording means for vertical and horizontal anchoring of said units in the concrete.

5, In a road joint forming mechanism, the ccmbination of complementary load transmission anchoring units comprising vertically arranged plate members, the plate members on each side forming a pocket, and a tongue carried by the opposed plate and occupying' Said pocket, and means on said units forming vertical andy horizontal bearing surfaces so that when saidjoint is embedded in concrete said bearing surfaces will transmit applied loads so thatsaid loads are restricted by the compressive strength of the concrete.v f

ALAN E. BRICKMAN.V GEORGE A. GLEASON. 

